Construction of segregated arrays of multiple donor and acceptor units using a dendritic scaffold

Remarkable dendrimer effects on photoinduced charge separation

Wei Shi Li, Kil Suk Kim, Dong Lin Jiang, Hiroyuki Tanaka, Tomoji Kawai, Jung Ho Kwon, Dongho Kim, Takuzo Aida

Research output: Contribution to journalArticle

109 Citations (Scopus)

Abstract

Dendritic molecules appended with multiple zinc porphyrin units (DP m, m [number of zinc porphyrin units] = 6, 12, and 24) trap bipyridine compounds carrying multiple fullerene units (Py2P n, n [number of C60 units] = 1-3), affording coordination complexes DPm⊃Py2Fn having a photoactive layer consisting of spatially segregated donor and acceptor arrays on their surface. Complexes DPm⊃Py2Fn are stable enough (K [average binding affinity] = 1.1 × 106-4.4 × 106 M-1 in CHCl3 at 25 °C) to be isolated by gel permeation chromatography. UHV-STM microscopy enables clear visualization of a petal-like structure of DP12⊃Py2F3. Photoexcitation of the zinc porphyrin units in DPm⊃Py 2Fn results in a zinc porphyrin-to-fullerene electron transfer to generate a charge separation. The charge-separation rate constant (kCS) in CH2Cl2 at 20 °C increases from 0.26 × 1010 to 2.3 × 1010 s-1 upon increment of m and n, whereas the charge-recombination rate constant (k CR) remains almost unchanged at 4.5 × 106-6.7 × 106 s-1. Consequently, DP24⊃Py 2F3 furnishes the largest ratio of kCS/k CR (3400) among the family.

Original languageEnglish
Pages (from-to)10527-10532
Number of pages6
JournalJournal of the American Chemical Society
Volume128
Issue number32
DOIs
Publication statusPublished - 2006 Aug 16

Fingerprint

Dendrimers
Porphyrins
Scaffolds
Zinc
Fullerenes
Rate constants
Photoexcitation
Coordination Complexes
Gel permeation chromatography
Genetic Recombination
Gel Chromatography
Microscopy
Microscopic examination
Visualization
Electrons
Molecules
zinc hematoporphyrin

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Li, Wei Shi ; Kim, Kil Suk ; Jiang, Dong Lin ; Tanaka, Hiroyuki ; Kawai, Tomoji ; Kwon, Jung Ho ; Kim, Dongho ; Aida, Takuzo. / Construction of segregated arrays of multiple donor and acceptor units using a dendritic scaffold : Remarkable dendrimer effects on photoinduced charge separation. In: Journal of the American Chemical Society. 2006 ; Vol. 128, No. 32. pp. 10527-10532.
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Construction of segregated arrays of multiple donor and acceptor units using a dendritic scaffold : Remarkable dendrimer effects on photoinduced charge separation. / Li, Wei Shi; Kim, Kil Suk; Jiang, Dong Lin; Tanaka, Hiroyuki; Kawai, Tomoji; Kwon, Jung Ho; Kim, Dongho; Aida, Takuzo.

In: Journal of the American Chemical Society, Vol. 128, No. 32, 16.08.2006, p. 10527-10532.

Research output: Contribution to journalArticle

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AU - Li, Wei Shi

AU - Kim, Kil Suk

AU - Jiang, Dong Lin

AU - Tanaka, Hiroyuki

AU - Kawai, Tomoji

AU - Kwon, Jung Ho

AU - Kim, Dongho

AU - Aida, Takuzo

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